html{
	font-size:  13.333333333333334vw;
}
body {
	font-family: helvetica;
	max-width: 750px;
	margin: 0 auto;

	font-size: 12px;	/* 需要限制一个字体大小，要不然的话默认字体大小也会跟着变 */
}
body * {
	-webkit-user-select: none;
	-webkit-touch-callout: none;
	-webkit-text-size-adjust: 100%;
}
a,button,input {
	-webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}
button,input {
	-webkit-appearance: none;
	border-radius: 0;
}
a {
	text-decoration: none;
}
input {
	outline: none;
	vertical-align: middle;
	padding: 0;
}
ul{
	margin: 0;
	padding: 0;
	list-style: none;
}
img{
	vertical-align: middle;
}
h1,h2,h3,h4,p{
	margin: 0;
}
.left {
	float: left;
}
.right {
	float: right;
}
.clearfix:after {
	content: '';
	display: block;
	clear: both;
}

@media screen and (min-width: 750px){
	html{
		font-size: 100px;	/* 页面达到750的时候1vw=750/100=7.5px，这时根字体的大小为9.259259259259261vw，此时转成px为7.5*9.259259259259261=69.444px */
	}
}



